I’d recommend that you talk to your RA to attempt to make the rest of the semester more tolerable (certainly at least in terms of cleanliness at a minimum) and then go to ResLife and see if you can make arrangements to switch rooms next semester.
@Ker1010…I am sorry your roommate is being such a pain in the ***. Honestly, I am with you. I do think it is rude and mean spirited to insist that a roommate is not allowed to have an overnight guest, of either gender. Alas most people here on CC seem to feel that it is rude to think a roommate should be allowed an overnight guest. But I am in the minority and have been for many, many years.
But it is just 6 more weeks, I promise you will not “go crazy”. It does sound like you need to have some arbitration. Go to ResLife.
There was a multiple page thread a few months back dealing in part with roommates and overnight visitors. Roommate problems can be complicated with different views on how best to resolve them.
Also think of this from the roommates point of view…A strange man is going to be sleeping 6 feet away from her. That can be disconscerting. You know him, but she doesnt.
But since she signed a contract, I would not worry about it. I would clean up the sink and shove her clothes in her closet and be happy my bf can stay over.